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Concentrator performance within a centrally fuel-rich primary air burner: Influence of multiple levels

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  • Chen, Zhichao
  • Li, Zhengqi
  • Zhu, Qunyi
  • Yang, Lianjie
  • Chen, Lizhe

Abstract

Within a gas/particle two-phase testing facility, multi-level concentrators were investigated by obtaining gas/particle two-phase characteristics of each concentrator within a centrally fuel-rich swirl burner. Measurements of velocities, particle volume flux profiles and relative particle number concentrations were obtained and analyzed to assess the performance of these concentrators. For concentrators with fewer levels, peak values of the axial particle volume flux were observed to move away from the central axis of the primary air duct. The rich/lean air ratios near the exit of the last ring were much larger for the single-level concentrator than for the 2- and 3-level concentrators. Conversely, the concentration ratio is always smaller for the single-level concentrator than for the others. In addition, the performance ratio RCR near the exit is always larger than 2, indicating that the 2- and 3-level concentrators can achieve a stable flame. The resistance coefficient increased with fewer rings making up the concentrator.

Suggested Citation

  • Chen, Zhichao & Li, Zhengqi & Zhu, Qunyi & Yang, Lianjie & Chen, Lizhe, 2011. "Concentrator performance within a centrally fuel-rich primary air burner: Influence of multiple levels," Energy, Elsevier, vol. 36(7), pages 4041-4047.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:7:p:4041-4047
    DOI: 10.1016/j.energy.2011.04.045
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    References listed on IDEAS

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    1. Chen, Zhichao & Li, Zhengqi & Wang, Zhenwang & Liu, Chunlong & Chen, Lizhe & Zhu, Qunyi & Li, Yuan, 2011. "The influence of distance between adjacent rings on the gas/particle flow characteristics of a conical rings concentrator," Energy, Elsevier, vol. 36(5), pages 2557-2564.
    2. Fan, Weidong & Lin, Zhengchun & Li, Youyi & Zhang, Mingchuan, 2010. "Experimental flow field characteristics of OFA for large-angle counter flow of fuel-rich jet combustion technology," Applied Energy, Elsevier, vol. 87(8), pages 2737-2745, August.
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    1. Ti, Shuguang & Chen, Zhichao & Li, Zhengqi & Xie, Yiquan & Shao, Yunlin & Zong, Qiudong & Zhang, Qinghua & Zhang, Hao & Zeng, Lingyan & Zhu, Qunyi, 2014. "Influence of different swirl vane angles of over fire air on flow and combustion characteristics and NOx emissions in a 600 MWe utility boiler," Energy, Elsevier, vol. 74(C), pages 775-787.
    2. Zeng, Lingyan & Li, Zhengqi & Zhao, Guangbo & Li, Jing & Zhang, Fucheng & Shen, Shanping & Chen, Lizhe, 2011. "The influence of swirl burner structure on the gas/particle flow characteristics," Energy, Elsevier, vol. 36(10), pages 6184-6194.
    3. Chen, Zhichao & Wang, Zhenwang & Li, Zhengqi & Xie, Yiquan & Ti, Shuguang & Zhu, Qunyi, 2014. "Experimental investigation into pulverized-coal combustion performance and NO formation using sub-stoichiometric ratios," Energy, Elsevier, vol. 73(C), pages 844-855.

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